Fruit Flies

In: Science

Submitted By elodge
Words 685
Pages 3
The Genetics of Fruit Flies can be Used to Understand Human Genetics

A gene is the functional and physical unit of heredity passed from parent to offspring. Genotype and phenotype are products of the different genes that one inherits. Genotype is the genetic constitution of an organism or cell. The observable physical and/or biochemical characteristics of the expression of a gene are the phenotypes (Genetics Home Reference 2013). A monohybrid cross is for a single trait when different alleles are combined through mating. A dihybrid cross calls focuses on two traits. Alleles on the sex chromosomes result in sex linked traits. In this experiment, multiple generations of Drosophilia melanogaster were examined and their hereditary traits analyzed. My hypotheses is that the traits will end up in a 1:1 ratio.The goal of this experiment was to note the traits of the fruit flies and how they relate to human genetics.

Section Fri


F2 Generation Predictions Results

Eye Color


Half Red, Half White Half winged, Half Not All Red All Males had Wings

Materials and Methods: A parental generation of the fruit flies was obtained. Then 10 flies, 5 of each gender, of the F1 generation were obtained from the parent generation. Then 50-60 members of the F2 generation were obtained. At each stage, gender, eye color and wings were examined using a dissecting microscope after the flies were knocked out by FlyNap. Next, in the large petri dishes, crosses 2A and 2B were made, again noting gender, eye color and wings.

Cross 2B Parent Gen. F1 Gen.

Male Red Eyes White Eyes

Female White Eyes Red Eyes


Throughout this experiment, red eyes were consistently shown to be dominant in all cases. Out of 51 flies tested after having a parent generation with one carrier of red eyes, all of the offspring had red eyes. White eyes were…...

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